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Old 03-30-2008, 10:21 AM   #1 (permalink)
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NSF100 110cc legal race head kit

Would there be any interest in a bolt-on 109cc kit with a ported 29/24 head?
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Old 03-30-2008, 05:56 PM   #2 (permalink)
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Re: NSF100 110cc legal race head kit

Hell ya how much?
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Old 03-30-2008, 06:29 PM   #3 (permalink)
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Re: NSF100 110cc legal race head kit

About $350. Should have pics in a week or so.
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Old 03-30-2008, 08:23 PM   #4 (permalink)
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Re: NSF100 110cc legal race head kit

no way !!!!
you did it!!
how does it run?
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Old 04-01-2008, 01:03 PM   #5 (permalink)
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Re: NSF100 110cc legal race head kit

I would love to see it. Any performance reviews would be awsome!
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Old 04-01-2008, 06:38 PM   #6 (permalink)
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Re: NSF100 110cc legal race head kit

I'm waiting on the pistons. It's a modified Lifan BV head, ported with o/s valves. It has a bearing cam, and straighter and larger ports. Won't fit a XR frame, but runs right up the middle of a NSF or lowly YSR. Just checking interest before I make more than the first one.
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Old 04-01-2008, 09:07 PM   #7 (permalink)
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Re: NSF100 110cc legal race head kit

PRC in florida has a 110cc kit for the 100 motors, whats different about your kit, not trying to be offensive, just wondering
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Old 04-01-2008, 09:21 PM   #8 (permalink)
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Re: NSF100 110cc legal race head kit

Trailbikes sells a 115cc kit that utilizes the stock head for the NSF100 as well.

Fire - It sounds like the kit you are developing includes a different head. Just be aware if you market your services here, you'll be paying to advertise...
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Old 04-01-2008, 09:33 PM   #9 (permalink)
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Re: NSF100 110cc legal race head kit

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Originally Posted by Z View Post
Trailbikes sells a 115cc kit that utilizes the stock head for the NSF100 as well.

Fire - It sounds like the kit you are developing includes a different head. Just be aware if you market your services here, you'll be paying to advertise...
That's the thing, the stock head is a turd that won't take a polish, not even a dull shine. Small valves placed too close together, a horrible offset port, and the bearing-less dealio. Like Uncle Eddie always said "You can't make chicken salad outta chicken zh!t, not GOOD chicken salad anyway".

And 115cc won't fit a 110cc class limit, without a little de-stroking, but that's another story

It's a Lifan BVH modded to bolt to an XR barrel, with the right domed piston to make it squeeze ok. Only one so far, and it's not 100% ready. I'm still sorting cam sprockets vs deck height issues. 14/28, 15/30, and 16/32, wanna get the tensioner to work just right. Might even end up with a long-rod 80 crank instead to save some lathe work going all Jenny Craig on the 100 lump.

I wouldn't dream of skirting the payola, and would just be offing some parts I have and decided I'm not going to use.

Just feeling around

Last edited by firepower354; 04-01-2008 at 09:37 PM.
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Old 04-04-2008, 03:22 PM   #10 (permalink)
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Re: NSF100 110cc legal race head kit

Oops, I thought u were talkn bout an NSR.
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Old 04-07-2008, 12:20 PM   #11 (permalink)
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Re: NSF100 110cc legal race head kit

I'd definetly be interested depending on work involved and power output vs. the powroll 110 kit for the XR100:
POWROLL PRODUCTS FOR THE HONDA XR100 2001-CURRENT
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Old 04-07-2008, 07:30 PM   #12 (permalink)
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Re: NSF100 110cc legal race head kit

The stock head is a turd. Powroll adds compression, but still gonna have little ports and valves.
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Old 04-12-2008, 08:54 PM   #13 (permalink)
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Re: NSF100 110cc legal race head kit

Sweet! Yet another reason to hate the lame-azz stock head. The 118 I built for the neighbor kid's 80 stopped running. I peeked at the top end today. Web 69/68 was blue. Not a good sign. Ported head, cam, rockers all junk. Looked like an oiling issue, and the lack of bearings on the cam made a bad deal go worse.
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Old 04-13-2008, 07:15 AM   #14 (permalink)
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Re: NSF100 110cc legal race head kit

yeah.... have seen numerous stock xr100 head issues on road racers. on low rpm "trail use" bikes its probably never an issue. built a 115 superhead motor for a friend 2 years ago. it ripped. the stock head on most of the 4strokes is the issue, but the 100 is horrible..... like we all dont know that.....
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Old 04-13-2008, 11:44 AM   #15 (permalink)
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Re: NSF100 110cc legal race head kit

anybody else ever use the takegawa super head on the crf/xr/nsf 100 ?? I am doing a build for a friend now and I am wondering how far the takegawa 115 cylinder can be bored to before I order it ??
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Old 04-13-2008, 05:58 PM   #16 (permalink)
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Re: NSF100 110cc legal race head kit

Hundreds of them out there...

The 115 kits are about maxed for bore. The case hole ID is too small for a big meaty sleeve. You can sleeve one offset, and bore the cases to the edge of disaster and get about 60mm bore. I know a guy trying a SCUT type setup too

There's room to throw a bunch more crank around in there though.
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Old 08-07-2008, 10:40 PM   #17 (permalink)
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Re: NSF100 110cc legal race head kit

I'd be interested in a 110. BTW, has anyone heard of a 107cc kit for ans NSF100?
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Old 08-08-2008, 05:02 AM   #18 (permalink)
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Re: NSF100 110cc legal race head kit

Quote:
Originally Posted by Gabriel H View Post
I'd be interested in a 110. BTW, has anyone heard of a 107cc kit for ans NSF100?
The swap is still not complete. Machine time has been an issue, lately.

2mm overbored stocker is 107. Pretty common. Powroll has one, but for the stock (lame) head.

I've got a bottom end with a light crank and 80 trans for sale, too, if you're looking for a little more Zing.

Last edited by firepower354; 08-08-2008 at 05:13 AM.
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